If you mean "how can you know you can trust the charities on GiveWell", the whole point of GiveWell is to rank charities by how effectively they use their donat

If you mean "how can you know you can trust the charities on GiveWell", the whole point of GiveWell is to rank charities by how effectively they use their donations to help people. If you mean "how do you know you can trust GiveWell", I guess you don't.